參數(shù)資料
型號(hào)： ADA4940-1ARZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 1/33頁(yè)
文件大?。?/td> 0K
描述： IC DIFF ADC DVR 18BIT LN 8SOIC
標(biāo)準(zhǔn)包裝： 98
放大器類型： 差分
電路數(shù)： 1
輸出類型： 差分
轉(zhuǎn)換速率： 95 V/µs
-3db帶寬： 260MHz
電流 - 輸入偏壓： 1.1µA
電壓 - 輸入偏移： 60µV
電流 - 電源： 1.25mA
電流 - 輸出 / 通道： 46mA
電壓 - 電源，單路/雙路(±)： 3 V ~ 6 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 管件
Ultralow Power, Low Distortion
Fully Differential ADC Driver
Data Sheet
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
2011–2013 Analog Devices, Inc. All rights reserved.
FEATURES
Small signal bandwidth: 260 MHz
Ultralow power 1.25mA
Extremely low harmonic distortion
122 dB THD at 50 kHz
96 dB THD at 1 MHz
Low input voltage noise: 3.9 nV/√Hz
0.35 mV maximum offset voltage
Balanced outputs
Settling time to 0.1%: 34 ns
Rail-to-rail output: VS + 0.1 V to +VS 0.1 V
Adjustable output common-mode voltage
Flexible power supplies: 3 V to 7 V (LFCSP)
Disable pin to reduce power consumption
ADA4940-1 is available in LFCSP and SOIC packages
APPLICATIONS
Low power PulSAR/SAR ADC drivers
Single-ended-to-differential conversion
Differential buffers
Line drivers
Medical imaging
Industrial process controls
Portable electronics
GENERAL DESCRIPTION
The ADA4940-1/ADA4940-2 are low noise, low distortion fully
differential amplifiers with very low power consumption. They
are an ideal choice for driving low power, high resolution, high
performance SAR and sigma-delta (Σ-Δ) analog-to-digital
converters (ADCs) with resolutions up to 16 bits from dc to
1 MHz on only 1.25 mA of quiescent current. The adjustable
level of the output common-mode voltage allows the ADA4940-1/
ADA4940-2 to match the input common-mode voltage of
multiple ADCs. The internal common-mode feedback loop
provides exceptional output balance, as well as suppression of
even-order harmonic distortion products.
With the ADA4940-1/ADA4940-2, differential gain
configurations are easily realized with a simple external feedback
network of four resistors determining the closed-loop gain of
the amplifier. The ADA4940-1/ADA4940-2 are fabricated using
Analog Devices, Inc., SiGe complementary bipolar process,
enabling them to achieve very low levels of distortion with an
input voltage noise of only 3.9 nV/√Hz. The low dc offset and
excellent dynamic performance of the ADA4940-1/ADA4940-2
make them well suited for a variety of data acquisition and signal
processing applications.
FUNCTIONAL BLOCK DIAGRAMS
1
–FB
2
+IN
3
–IN
4
+FB
11 –OUT
12 DISABLE
10 +OUT
9
VOCM
5
+V
S
6
+V
S
7
+V
S
8
+V
S
15
–V
S
16
–V
S
14
–V
S
13
–V
S
ADA4940-1
08452-
001
ADA4940-2
1
–IN1
2
+FB1
3
+VS1
4
+VS1
5
–FB2
6
+IN2
15 –VS2
16 –VS2
17 VOCM1
18 +OUT1
14 DISABLE2
13 –OUT2
7
–
IN2
8
+
F
B2
9
+V
S
2
11
V
OC
M
2
12
+
O
UT
2
10
+V
S
2
21
–V
S
1
22
–V
S
1
23
–
F
B1
24
+
IN1
20
DI
S
ABL
E
1
19
–
O
UT
1
Figure 1.
0
–160
–140
–120
–100
–80
–60
–40
–20
0
20k
40k
60k
80k
100k
08452-
300
AM
P
L
IT
UDE
(
d
B)
FREQUENCY (Hz)
+DIN
–DIN
R1
R2
R4
R3
+IN
–OUT
CF
33
2.5V
AD7982
ADA4940-1
33
2.7nF
CF
+OUT
+
–
–IN
IN+
IN– GND
VDD
REF
VOCM
The ADA4940-1 is available in a Pb-free, 3 mm × 3 mm, 16-lead
LFCSP, and an 8-lead SOIC. The ADA4940-2 is available in a Pb-
free, 4 mm × 4 mm, 24-lead LFCSP. The pinout is optimized to
facilitate printed circuit board (PCB) layout and minimize
distortion. The ADA4940-1/ADA4940-2 are specified to
operate over the 40°C to +125°C temperature range.
Table 1. Similar Products to the ADA4940-1/ADA4940-2
Product
Isupply
(mA)
Bandwidth
(MHz)
Slew Rate
(V/s)
Noise
(nV/√Hz)
3
110
450
8.25
9
560
2800
3.6
2.2
31
22
5.1
Table 2. Complementary Products to the ADA4940-1/ADA4940-2
Product
Power
(mW)
Throughput
(MSPS)
Resolution
(Bits)
SNR
(dB)
7.0
1
18
98
10.5
1.333
18
96.5
65
3
16
88
45
1.333
16
88
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